Climate warming is likely to weaken the performance of two-phase closed thermosyphon on the Qinghai-Tibet Plateau  

作　　者：Guan-Li JIANG Zi-Teng FU Xin-Yu MEN Hong-Ting ZHAO Si-Ru GAO Yong-Zhi LI Qing-Bai WU 

机构地区：[1]State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China [2]Beiluhe Observation and Research Station on Frozen Soil Engineering and Environment in the Qinghai-Tibet Plateau,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China [3]Muli Field Scientific Observation and Research Station for Gas Hydrate,China Geological Survey,Beijing 100083,China [4]University of Chinese Academy of Sciences,Beijing 100049,China [5]School of Civil Engineering and Architecture,Jiaxing Nanhu University,Jiaxing 314001,China

出　　处：《Advances in Climate Change Research》2024年第1期90-100,共11页气候变化研究进展（英文版）

基　　金：funded by the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (2021QZKK0205 and 2021QZKK0201);the Research Project of the State Key Laboratory of Frozen Soil Engineering (SKLFSE202101).

摘　　要：Over the years,numerous geotechnical approaches have been implemented to mitigate the adverse effects of climate warming on various infrastructures in the permafrost region of the Qinghai-Tibet Plateau(QTP),such as the Qinghai-Tibet Highway and Railway,and achieved the expected engineering outcomes.However,little attention has been given to whether the performance of these geotechnical approaches has changed during the ongoing process of climate warming.To investigate the performance variation of one of these geotechnical approaches,which is two-phase closed thermosyphon(TPCT),during sustained climate warming,we conducted a statistical analysis of soil temperature monitoring data in 2003-2020 from eight regular embankments and six TPCT embankments in our permafrost monitoring network.The results indicate that TPCT undeniably has a cooling effect on the permafrost beneath embankments,even rapidly eliminated previously formed taliks beneath embankment.However,further analysis reveals that the performance of TPCT has been weakening during sustained climate warming,which has confirmed by the re-forming of the taliks beneath embankment where they had been previously eliminated.Based on the current understanding,we attributed the weakening of thermosyphon performance to a significant reduction in the air temperature freezing index caused by ongoing climate warming.Through this study,we aimed to draw attention to the evolving performance of geotechnical approaches in permafrost regions amid climate warming,prompting necessary engineering innovations to address this situation and ensure the sustainable development of the permafrost region on the QTP.

关 键 词：Two-phase closed thermosyphon Climate warming Supra-permafrost talik Permafrost degradation Qinghai-Tibet Highway 

分 类 号：P467[天文地球—大气科学及气象学]